PET formulas (Heat Overlay): Difference between revisions
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==PET Sun formula== | ==PET Sun formula== | ||
The PET sun formula is as followed:<br> | The PET sun formula is as followed:<br> | ||
PET<sub>sun</sub> = -13.26 + 1.25·T<sub>a,t</sub> + 0.011·Q<sub>gl,t</sub> - 3.37·ln(u<sub>t</sub>) + 0.078·T<sub>w,t</sub> + 0.0055·Q<sub>gl,t</sub>·ln(u) + 5.56·sin(ϕ) - 0.0103·Q<sub>gl,t</sub>·ln(u)·sin(ϕ)+0.546·B<sub>b,t</sub> + 1.94·S<sub>vf</sub><br> | PET<sub>sun</sub> = -13.26 + 1.25·T<sub>a,t</sub> + 0.011·Q<sub>gl,t</sub> - 3.37·ln(u<sub>t</sub>) + 0.078·T<sub>w,t</sub> + 0.0055·Q<sub>gl,t</sub>·ln(u) + 5.56·sin(ϕ<sub>t</sub>) - 0.0103·Q<sub>gl,t</sub>·ln(u)·sin(ϕ<sub>t</sub>)+0.546·B<sub>b,t</sub> + 1.94·S<sub>vf</sub><br> | ||
where, | where, | ||
* | * T<sub>a,t</sub> | ||
* Q<sub>gl,t</sub> | |||
* u<sub>t</sub> | |||
* T<sub>w,t</sub> | |||
* Q<sub>gl,t</sub> | |||
* ϕ<sub>t</sub> | |||
* B<sub>b,t</sub> | |||
* S<sub>vf</sub> | |||
Revision as of 15:54, 11 September 2019
The physiological equivalent temperature PET is calculated for two possible options based on the situation:
- A cell is in the shade or it is night at time t: PETshade, night;
- A cell is in the sun during the day: PETsun;
PET Sun formula
The PET sun formula is as followed:
PETsun = -13.26 + 1.25·Ta,t + 0.011·Qgl,t - 3.37·ln(ut) + 0.078·Tw,t + 0.0055·Qgl,t·ln(u) + 5.56·sin(ϕt) - 0.0103·Qgl,t·ln(u)·sin(ϕt)+0.546·Bb,t + 1.94·Svf
where,
- Ta,t
- Qgl,t
- ut
- Tw,t
- Qgl,t
- ϕt
- Bb,t
- Svf